Sewing machine



' R. LOEB.

SEWING MACHINE.

v APPLICATION FILED DEC. 12. 191!- 1,1 93,803. Patented Aug. 8, 1916.

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R. LOEB.

SEWING MACHINE.

APPLICATION FILED,DEC.12. 1911.

1 1 93,803 Patented Aug. 8-, 1916.

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R. LOEB SEWING MACHINE.

APPLICATION FILED DEC.I2. 19 11.

1 1 93,803 Patented Aug. 8, 1916.

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R. LOEB.

SEWING MACHINE.

APPLICATION FILED DEC.I2. Ian.

1 1 93,803. Patented Aug. 8, 1916.

5 SHEETSSHEET 5- stares PATENT BUDOLF LOEB, OF CAMIIDEN, NEW JERSEY.

SEEVING-MACHINE.

Liggfigg specification of Letters Patent. Pate t-ed A a; 8 1916 Application filed December 12, 1%11. Serial No. 665,395.

To aZZw/wm it may concern: Fig. 2; Figs. 5, 6, 7 and 8, are sectional Be it known that I, RUnoLr LOEB, a citiviews on the lines 6-6, c-0, cZ-cl and e-e, zen of the United States, and a resident of respectively, Fig. 4; Fig. 9, is a perspective Camden, Camden county, New Jersey, have view of the operative parts of the mechanism 5 invented certain Improvements in Sewingdisposed in the head of the improved ma- 60 Machines, of which the following is a specifichine forming the subject of my invention, cation. and Figs. to 15, inclusive, are diagram- My invention relates to sewing machines matic views of some forms of stitches which of the type designed to produce stitches to may be developed with the use of my im- 10 follow preconceived designs, or designs deproved machine. 65 veloped during the operation of the ma- In this improved machine, a vertically rechine; such stitches forming surface emciprocating needle bar is employed to which broidery. a needle is attached, and adjacent thereto The mechanism forming the subject of my and mounted back to back is a bar known as invention has been applied to a suitable form a helper or vertical feed bar. In the present 70 of sewing machine; and the object and feamechanism the feed of the goods is accomture of my invention is the development of plished by the operator. This bar is recipsuch a machine and the provision therewith rocated vertically, however, by suitable of the necessary and desired mechanism means of substantially the same character as which will cause the needle to move and deheretofore employed. 75 velop a stitch on the goods without move- The feature ofmy invention i th means ment of the latter by the stitch forming for imparting reciprocatory movement to mechanism; the movement of the goods bethe needle bar and needle to efiect the formaing at all times under the control of the o tion of the embroidery stitches, and the erator. In this way, designs comprehendmeans to efiect differences in the length of so ing flowers, birds and the various SO-Oalled the stitches, which is accomplished by the ribbon effects, may be readily formed. means for actuating the needle bar. Said A. further object of my invention is the needle bar is constrained in one direction by application of a presser foot which may also means of a suitable spring, and the movebe employed with my improved needle opment of the same regulating the length 01" 85 crating mechanism, and, if desired, may be stitch is in the opposite direction. To move used to move the fabric while the stitches are this needle bar in the opposite direction, the

being formed. 4 improved mechanism, hereinafter described,

In my lmproved machine, the mechanism 1s employed. provided for effecting movement of th 1166- In the drawings, 1 represents the frame 90 dle may be regulated toproduce stitches of of the machine having a head 2 and the equal length, or short and long stitch usual pulley 3 and hand wheel 4, whereby cessively; the long stitches being of the same the main driving shaft 5 may be operlength, and the short,.stitches of the same ated. The head is closedby the usual plate length, or stitches may be produced Varying 6, and contains the needle operating meclia- 95 in length between the shortest and the longnism as hereinafter described. est, as may be, desired, to effect or produce In the improved construction forming the the embroidered surface. subject of my invention, I provide a bar 10 Th s d oth r features of ay/invention vertically movable in a relatively fixed path,

are more fully described hereinafter, referwhich bar carries the usual cam plate 11 100 encebein'ghad to the accompanyingdrawcommon to machines of this type, and this ings, in which: bar is raised and lowered by the action of Figure 1, is a rear elevation of a sewing a roller 12, carried bya'cam 13 mounted on machine having and containing the improve the end of the main driving shaft 5 of the ments forming the subject ofmy invention; machine. This shaft may be driven in any 105 Fig. 2, is an end elevation of the same with suitable or approved manner, such as by the head plate removed; Fig. 3, is a view of means of a foot lever or treadle, or suitable a portion of the structure illustrated in Fig. power mechanism. Pivotally connected at 1, showing the parts in a difi'erent relation; 15 to said bar 10, is a needle bar 16, and this Fig. 1, is a sectional view on the line aa, needle bar is not only raised and lowered by 11c said bar 10, but has a number of other mo tions imparted to it during the operation of the machine to effect oscillation of the same, whereby stitches of the desired character may be formed. The oscillation and the extent thereof is controlled by a numberof elements hereinafter described. In the first place, the pivotal connection of the bar,l6 with the bar 10 is slotted so that the position of said bar 16 with respect to the bar 10 may be changed. at many intervals and at any time during the operation of the machine. Guiding means for this bar are dis posed in the upper portion of the head, and comprise a series of plates in edgewise engagement with said needle bar 16; one of said plates, indicated at 19, being pivoted at 20 and engaging another plate 21 pivoted at 22 to a movable part, 22, common to machines of this character which plate 21 carries at its lower end a presser foot 24. The presser foot 24 is vertically reciprocated so as to engage the work during the time the needle is passing into and out of the same, but its time of engagement with the work differs from that of the needle, so that the operator may be free to move the Work during the intervals between the formation of the stitches. On the opposite side of the bar 16 a plate 26 is mounted, engaged by a screw 27, which may have a round end, passed through the wall of the head, and said plate is capable of movement on the pivot formed by the rounded end of said screw.

As shown in the drawings herewith, the machine is set for the formation of long and short stitches. Disposed within the head is a spring 30 having an arm in engagement with the bar 21, which is directly adjacent the bar 16; such bar 21 tending to shift the said needle bar in one direction. To effect movement of said bar 16 in an opposite direction, the following mechanism is employed: Pivoted at 35 to the head of the machine is a bell crank lever 36, having one end with a suitable roller 37 engaging the needle bar 16, while its opposite end is pivotally connected to a link 38, the position of which is controlled by a roller 39 carried by a gear segment 40 pivoted at 41, and suitably controlled, as hereinafter described. The lever 36 and link 38 form a jointed lever. A spring 42 is further provided to keep these parts normally in one position. Disposed on the outside of the frame is an element 44 pivoted at 45, having an arm 46 projecting inside the head and outwardly extending arms 47 and 48; the latter having suitable rollers 49 and 50, respectively, journaled in their ends. This element v44 is laterally movable to a plurality of positions whereby the roller 49 of the arm 47 may engage the cam 51 carried by the shaft 51 or the roller 50 of the arm 48 may engage the cams 52 carried by the shaft 52. The shaft 51 carries a single cam 51, while the shaft 52 carries a pair of cams 52 oppositely disposed and so designed as to eifect the formation of short and long stitches. One of the arms with its accompanying roller is always in engagement with one of the cams. As shown in Fig. 1 of the drawings, the said roller 50 is disposed for engagement with the cams 52 designed to effect the formation of short and long stitches; the drawings showing it actually in engagement with the short cam. The engagement of this cam turns the element 45 on its pivot so that its inner arm 46 en ages the link 38, moving the same downwarc ly, and by reason of its stoppage by engagement with the roller 39 the bell crank lever 36 is moved on its pivot, throwing the needle bar rearwardly. The extent of such rearward movement is less for the low cam than for the high cam, and this difference in the extent of movement of the needle will make the difference between the short and long stitches formed by such needle.

It will be noted that the cam 51 for making the long stitches is carried by the shaft 51*, which parallels said driving shaft and receives movement therefrom by reason of suitable gearing, and that for every two revolutions of said shaft 51 one stitch is formed. The cams 52 are carried by the shaft 52 which is driven from the shaft 51 by means of the gears 55 and 56 which are in such relation to each other that for ever revolution of the shaft 51 said shaft 52 will be given one-half a revolution.

The segmental element 40, carrying the roller 39, against which the link 38 fulcrums, is toothed, and in engagement with the teeth is a pinion 60 carried by a shaft 61 extending across the machine; the movement of which is controlled by a knee lever 62 in one direction and a spring 63 in another direction; said knee lever communicating movement to a vertically moving rod 65 having a rack 66 for engagement with a pinion 67 on the opposite end of said shaft.

Normally thestitch forming mechanism is in position for the formation of the short-est stitches possible in the operation of the machine; that is to say, the shortest of the long stitches controlled by the cam 51,'and the shortest of the short and long stitches controlled by the cams 52. The operator, throughthe medium of the knee lever and the mechanism controlled thereby, can increase the length of these stitches to the greatest length, and in the drawings herewith the mechanism is shown in the position to form stitches of the greatest length. By slackening engagement with the knee lever, the operator can shorten the stitches as desired; the spring raising the rack and shifting the position of the shaft 61 Which,

by reason of its pinion 60 in engagement with the gear segment 10 carrying the roller 39, which moves the link 38.

The shaft 61 also carries a cam arranged for engagement with the end 71 of a bell crank lever 72 pivoted at 73, and having its other end 74 disposed for engagement with a pin 7 5 arranged in line with the roller 37 on the end of the bell crank lever 36, which serves to move the needle bar rearwardly. The position of this pin 75 regulates the extent of movement which may be imparted by said bell crank lever to the needle bar, and such position is regulated by an adjustable set screw 75 carried by the end 7 4C of the bell crank lever 72.

When the pin 75 is in engagement with the set screw 7 5 carried by the end of the bell crank lever 7 i, the stitch formation is regular; that is to say, the stitches willbe of the same length. When the pin is moved in to its full extent by the bell crank lever 72 when the cam 7 O on the shaft 61 is turned by movement of the latter under the operation of the lmee lever, it controls the forward movement of the needle; the rearward movement of such needle being unaffected but its forward movement being stopped at what may be termed the center of its full swing or movement of oscillation. In Figs. 2 and 7 of the drawings, the pin 75 is shown in the extreme outer position, being so placed by the operation of the mechanism described when the operators knee is pressed against the lever 62. In such position, the needle bar is free to oscillate the full extent and stitches of equal length and of the extreme length will be produced. In such position, the gear segment has been shifted so that its roller is in the elevated position for engagement with the lever 38, which is actuated by the bell-crank-lever 45 every time the cam 51 operates the same.

The machine is equipped with the ordinary presser bar lifting device, comprising the vertically moving rod 76 in pivotal engagement with the bar 23 adjacent the needle bar 16; said bar 76 being under the control of a lever 7 8 pivoted at 79 to the head of the machine; a spring being carried by said bar 76 so as to lower the bar 23 when the lever is released.

The cams 51 and 52 are shiftable on their respective shafts by means of a lever 80 pivoted at 81, and having suitable slip con- 'nections with said cams; a supplemental lever 86 provided with notches 87 and 88 and held down by a suitable spring 89 being employed to hold the lever 80 in its respective positions.

The movement of the shaft 61 is controlled by the kneelever; the latter being arranged to lower the bar 65 with its rack 66 and turn the shaft in one direction, while the spring 63 serves to raise the rod and rack when pressure upon .the knee-lever is released. The downward movement of this rod is limited by the pin 90 adjustable in an arm 91 which is carried by said bar 65; said arm being adjustable on the bar 65, if desired.

Under general conditions in the operation of my improved embroidering sewing machine, the position in which the stitches are disposed is wholly under the control of the operator; that is to say, the work, usually carried in a tambour frame, may be moved in any direction and the stitching placed accordingly. In the present arrangement of the stitch forming mechanism, the needle reoiprocates toward and from the operator seated at the machine in the usual position and at right angles to the frame of the machine.

l/Vith reference to the formation of the stitches shown in the several diagrammatic views, the mechanism operates as follows:

Figs. 10 and 11, show stitches of regular length and in the formation of the same the knee treadle is pressed to its fullest extent, thereby moving the roller 39 the greatest distance possible from the pivot a, and the nearest possible distance to the point of contact Z), consequently giving the greatest movement possible to the roller 37, rearwardly; the frame acting as the stop in i the forward movement imparted by the spring 30, and the pin 75 being out of action as the screw 75 has been backed out. Fig. 11, shows the shading effected by the operator moving the goods at an angle or curve.

Fig. 12, shows stitches gracually decreasing in length and in the formation of the same, as the knee treadle is gradually released, the roller 39 is moved toward the pivot a, decreasing the rearward movement of the roller 37, the frame still acting to stop the forward movement of the bar 16.

Fig. 13, shows stitches of the same character as those illustrated in Fig. 10, except that in place of the frame acting as the stop for the forward movement, the pin 75 is brought into engagement with the lever 36, which in turn engages the bar 16 through the roller 37, thereby acting as the stop for the forward movement.

Fig. 14, shows stitches gradually decreasing in length and in the formation of the same as the knee treadle is released, the roller 39 is moved toward the pivot a through the segment 10, etc., reducing the rearward movement of the bar 16; the cam 70 at the same time being turned; the end 71 of the lever 72 riding up on the inclined surface of the cam 70, thereby throwing the end 74 of the lever 72 against the pin 75 which is now acting as the stop for the forward movement, and thereby reducing the forward movement of the bar 16. When the treadle is entirely released, the roller 39 has reached its nearest position with respect to the pivot a, and imparting the slightest possible movement, rearwardly, to the bar 16. The end 71 of the .lever 72 has reached the highest point on the cam 70, thereby throwing the pin 75 in as far as possible, allowing the slightest forward movement possible to the bar 16. The bar 16 is now held almost at the center of its greatest possible path of travel; only a very slight movement being allowed either side of this center.

Fig. 15, shows a series of combined short and long stitches.

I claim:

1. In a sewing machine, the combination of a vertically movable needle-bar, a needle carried thereby, means for raising and lowering the needle-bar, a spring tending to maintain said needle-bar in one position, means for oscillating said needle-bar in a single plane including a pivoted arm in engagement with the needle-bar, said arm serving to regulate the movement of said needle-bar in the opposite direction, and means under the control of the knee of the operator for changing the operative relation of said pivoted arm with respect to said needle-bar.

2. The combination, in a sewing machine, of a vertically movable needle-bar, a needle carried thereby, means for imparting oscillatory movement to said needle-bar, an adj ustable member for regulating the extent of oscillatory movement of the needle-bar in one direction, a pivoted arm in operative engagement with the means for eiiecting oscillatory movement of the needle-bar for positioning the latter with respect to the means for effecting oscillation thereof, and a knee-controlled cam for effecting the operation of said arm.

3. In a sewing machine, the combination with a needle, a needle-bar carrying the same and means for moving the needle-bar vertically, of a jointed lever, means in engagement with said jointed lever to cause the latter to effect oscillating movement of said needle-bar simultaneously with its vertical movements, including a pivoted arm in operative engagement with the needle bar, means for regulating the extent of such oscillation, said jointed lever having a free end, and a spring for holding said jointed lever in contact with the means tending to move the same.

4. In a sewing machine, the combination with a vertically movable needle and a needle-bar carrying the same, of a jointed lever having a free end, a spring for efiecting movement of said end in one direction, a bell-' crank lever for effecting operation of said jointed lever in the opposite direction to effect oscillation of said needle, a cam controlling said bell-crank lever, and means for operating the oscillation causing'mechanism whereby changes in the extent of such oscillation may be automatically effected.

5. In a sewing machine, the combination of a vertically movable needle, a jointed lever having a free end, a spring for controlling the movement of said free end, a pair of shafts, a cam on each of said shafts, a pivoted lever in engagement with said jointed lever, means for moving either one of said cams into engagement with said pivoted lever to effect oscillation ofsaid needle, and

an adjustable stop for limiting the extent of oscillation in one direction.

6. In a sewing machine, the combination with a vertically movable needle-bar, a needle carried thereby and means for raising and lowering said needle-bar, of yielding means tending to maintain said needle-bar in one position, a jointed lever in engagement with the needle-bar for efi ecting lateral or oscillatory movement of said needle in one direction against the pressure of said yielding means, said lever having a free end, a spring for effecting movement of said free end in one direction, a pivoted lever for operating said jointed lever in another direction, a cam for moving said pivoted lever, and means for efiecting changes in the 0perative action of said levers whereby changes in the extent of the oscillatory movement of the needle may be effected.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

' RUDOLF LOEB.

Witnesses:

W. B. BESSER, JAMES WV. REANEY.

Copies of this patent may'be obtained for five cents each, by addressing' the-Commissioner of Patents, Washington, D. G. 

